SingularityNET is a blockchain-based decentralized marketplace and network for AI services. It enables developers to publish AI/ML services (such as model inference, training, image processing, NLP, etc.) onto the network, where other users or applications can call them via API and pay using the native token AGIX (now ASI). Its architecture manages service registration, payment, and arbitration through smart contracts, utilizing multi-party escrow contracts and unidirectional payment channels for efficient off-chain transactions. SDKs, CLI, and a daemon abstract blockchain interactions, allowing developers to integrate and consume services without directly handling on-chain details.